Asked by Tyners

a barrel of oil at rest has a mass of 65kg it is rolled down a 1.2m ramp. Due to constant force exerted on it, the barrel reaches a velocity of 4.2 m/s upon leaving the ramp. Find the constant force on the barrel while it is on the ramp?

Help please.

Answers

Answered by bobpursley
It is unclear whether the barrel is rolling or sliding. If one assumes sliding down a frictionless ramp,

F=ma
where vf^2=2a*4.2 or a=vf^2/8.4
solve for f.

Now, if rolling, come back and say so, it is more complicated.
Answered by Tiaanne
rolling down a ramp not sliding
Answered by bobpursley
Now if it is rolling, the filled barrel has a moment of inertia of 1/2 Mr^2

The angular velocity at the bottom must be w=Vf/r

KE at bottom=PE at top
1/2 I w^2+ 1/2 m vf^2=mgh
so solve for h.
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